test image file conversion

$ docker run -it --rm -v "$PWD":/usr/src/myapp -w /usr/src/myapp python:3 python script.py
Importing pillow
Canot find package: pillow. Installing...
Collecting pillow
  Downloading Pillow-5.0.0-cp36-cp36m-manylinux1_x86_64.whl (5.9MB)
    100% |████████████████████████████████| 5.9MB 319kB/s
Installing collected packages: pillow
Successfully installed pillow-5.0.0
Select 1 to convert file to images
Select 2 to convert Images to File
: 2
please enter directory name containing images: ./
zey30QV.png Has been extracted
Conversion Complete
$ ls
output.tar.gz   script.py   zey30QV.png
$ file output.tar.gz
output.tar.gz: data
$ gunzip output.tar.gz
gunzip: output.tar.gz: not in gzip format
$ tar xzvf output.tar.gz
tar: Unrecognized archive format
tar: Error exit delayed from previous errors.
$ du -h output.tar.gz
 20M    output.tar.gz
$